My mom and her husband are traveling with us on the Western 7 day for their dream vacation: baby sitting on a cruise. She says she wants to just stay on the boat with our littlest one, but I'd like to get her an excursion or two if there's something she would enjoy that's low-impact. Key West looks like a no-brainer with the trolley tour. Castaway Cay is pretty straightforward. What about Cozumel and Grand Cayman? Are any of the ruins tours easy on the legs? Anything out there besides shopping?